Improvement in chisels



C. E. L. JELLIFFE.

CHISEL. No. 171,815. Patented Ja n.4,18'7 6.

N. FITERB. FHOTO-LITNOGRAPHER, WAEHINBTON. D G.

UNITED CHARLES JELL 'FFE', or ieavfonnn, new JERSEY.

IMPROVEMENT IN CHISELS.

Specification forming part of Letters Patent No. 1715815, dated January4, 1876; application filed June 21, 1875. v

To all whom it may concern:

Be it known that I, CHARLES E. L. JEL- LIFFE, of the city of Bayonne,county ofHudson and State of New Jersey, have invented, certain new anduseful Improvements'in Chisels; and I do hereby declare that thefollowin g is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings making part of the same, inwhich- Figure 1 represents aside view. Fig. 2 represents a sectionalview. Figs. 3 and 5 represent bottom views. Fig. 4 representsthecutting-bit and chisel-blade detached. Fig. 6 represents a sectionalview out through line as a. Fig. 5. I

Like letters in all the figures refer to the same parts.

My invention consists. in-certain improvements in chisels,whereby thechisel blade or shank is adapted to receive and hold ill-sue .cessiondifferent widths and shapes of bits,

for the purpose of making different widths and shapes of cuts, as willbe hereafter more fully explained.

The manner of constructing andpperating said improvements is as follows:I take a chisel-blade, shank, or other strip of suitable metal, to whicha tang or socket is forged or formed, for the purpose of affixin g thehandle or holder, similar to an ordinary chisel, (see Figs. 1, 2, 3, 4,5, and 6,-:A,) and on its outer end, and on one side thereof, which Iherein designate the top side, mill out or otherwise form a dovetail,scarf-joiiit, or other suitable device, K, and on one side of anotherpiece or pieces of suitable metal, B, mill out or otherwise form asimilar joint, K, so that the joint on the one, when slipped laterallyor otherwise placed together, will fit into the space or spaces on theother, and brace or hold against pressure applied at the end of theinstrument, (this latter piece B being the cutting-bit,) and when soplaced together to keep them from working apart when the instrument isin use, and also of allouing the cutting-bit B to be attached to, anddetached from, thechisel blade or shank A readily and instantaneously.On one side of the aforesaid shank 01 blade A, which I herein designatethe bottom side, I mill out or otherwise form a groove or slot, F,running lengthwise therewith nearly .upperend, under which there is aspring or other suitable device, and on its outer end form one or moreprongs, S S, said prongs extending through and working in holes orindentures'lhflformed in the outer end of the chisel blade 01" :Slltl1kA, so that when the cutting-bit is slipped laterally or otherwise placedthereon, the prongs catch into the holes I or indentures T, formedtherein, thereby keeping the cutting-bit firmly in place, ,andf omworking loose or oil its seat when the instrument is in use.

Itwill also be seen, in the aforesaid described form or mode of securingthe cutting-bit to the chisel blade or shank, that if the dovetail, orscarf joints K K are cut or formed at right angles with thecntting-bitand chisel blade or shank it would require a nicety of adjustment whenplaced together, that the prongs might instantaneouslycatch into theholes or indentures T in the cutting-bit; but to obviate this I cut orform the said joints K K, both on the bit and shank, (either on theright or left side thereof, as deemed convenient in using,) diagonallytherewith, (see Fig. 4, R 1%,) or, in other words,one. s ide I makeslightly wider than the other, so that when placed together itfitsaccurately in its proper position at once.

Figs. 5 and 6 represent bottom sectional and side. views of'a chisel"blade or shank, A, and cutting-bit B, having the dovetail or scarfjoints K K milled out or othervdise formed lengthwise therewith, thislatter form being equally simple, and I believe to be an equivalent modeof fastening the cutting-bit to the chisel blade or shank to the oneheretofore described; but I prefer the former, as shown in Figs. 1, 2,3, 4, the cutting-bit being more easily handled and adjusted thereonwhen in use.

The operation is as follows: When the cuttin g-bit is adjusted on thechisel-blade (the spring-catch, to allow of such adjustment, havingpreviously had its prongs withdrawn by means of pressure on thethumb-piece) the upward pressure of the spring forces the prongs intothe holes or indentures in the cutting-bit, and holds it therefirmly onthe blade or shank in place for use.

This arrangement admits ofithe easy-anri informs of cutting-bit aswidths and fqrmsof cut are required.

Now, having. fully described my invention, what I desire to claim andsecure by Letters Patent is Witnesses: 4

JOEN'MCMA'JION,

GEORGE F. SPENCER.

The bit B, in combination With the shankA BtanLaneOnsadjustment imddetachment: from and the spring-catch G, substantiallyas and the chiselblade or shank of as many sizes and for the purposes set forth. CHAS. L.JELLIFFE.

